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Thread: 350 SBC, MSD Atomic - surging at low RPM.

  1. #1

    Default 350 SBC, MSD Atomic - surging at low RPM.

    Hello all. I recently switched from the Holley 750 carb and installed the MSD Atomic on my '68 Camaro with 350 SBC, 4 speed manual transmission. Return fuel system, with regulator. Pump is on right frame rail at lowest point of frame rail elbow. Running Pulse Width (due to noisy pump) and not noticing a difference on NPW regarding surging.

    It runs well from 1500 RPM and up. Anything under 1500 RPM, the vehicle surges. At 15 MPH and below it surges such that it will buck unless I feather the clutch. Any suggestions as to what my contribute to the cause? What information do I need to provide to get some experience feedback? Thanks in advance.
    Last edited by 68 Camaroguy; 03-30-2020 at 03:46 PM.

  2. #2


    Verify the correct settings are programmed in the handheld e.g. camshaft selection. What is the fuel pressure, AFR and ignition timing.

  3. #3


    Watch your AFR while cruising I found mine going lean as it surged. The cam I have just fits in the top end of the ‘performance’ range. I had to make the cruise AFR target a bit richer than ‘normal’. I adjusted it a bit at a time until it stopped.

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